About Front Panel LEDs

The system status and control panel includes several LED status indicators, a Power button, and a security keyswitch. The following figure shows the status and control panel.

Several LED status indicators provide general system status, alert you to system problems, and help you to determine the location of system faults.

At the top of the status and control panel, three general status LEDs provide a snapshot of the system status.

Below the Power button and security keyswitch, a graphical display provides additional LED icons to indicate specific fault conditions and locations.

The general status LEDs work in conjunction with the specific fault LED icons. For example, a fault in the disk subsystem illuminates both the system Fault LED at the top of the panel and the Disk Fault icon in the graphical display below it. Fault LEDs within the enclosure help pinpoint the location of the faulty device. Since all front panel status LEDs are powered by the system's 5-volt standby power source, fault LEDs remain lit for any fault condition that results in a system shutdown.

During system startup, the front panel LEDs are individually toggled on and off to verify that each one is working correctly. After that, the front panel LEDs operate as described in the following table.

Name

Icon

LED Function

Power/OK

This green LED lights when the system power is on.

System Fault

This amber LED lights to indicate a serious system fault. When this LED is lit, one or more icons in the display panel may also light to indicate the specific nature and location of the fault.

OK-to-

Remove

This amber LED lights to indicate that an internal
hot-pluggable component is ready for removal.

Disk Fault

This amber LED lights to indicate a serious disk subsystem fault that is likely to bring down the system. When this LED is lit, one or more disk LEDs may also be lit at the front of the disk cage, indicating the source of the fault. See About Disk Drive LEDs.

Power Fault

This amber LED lights to indicate a serious power subsystem fault that is likely to bring down the system. When this LED is lit, one or more power supply LEDs may also be lit on the system rear panel. See About Power Supply LEDs.

Thermal Fault

This amber LED lights to indicate a serious thermal fault (fan fault or overtemperature condition) that is likely to bring down the system. There are two Thermal Fault LEDs in the display to indicate whether the fault is located on the left or right side of the system. In the event of a fan fault, a fault LED inside the system will indicate the faulty fan assembly. See About Fan Tray LEDs.

Attention Left Side

This amber LED lights to indicate that an internal component on the left side of the system requires servicing.

Attention Right Side

This amber LED lights to indicate that an internal component on the right side of the system requires servicing.

About CPU/Memory Slot LEDs

The CPU/Memory slot LEDs are located on the horizontal panel between CPU/Memory slots B and C and are visible when the right side door is open. There are two LEDs for each CPU/Memory slot, as shown below.

Icon

Name

LED Function

Power On

Lights when the slot is receiving power.

Fault

Reserved for future use.

About PCI Slot LEDs

The PCI slot LEDs are located on the vertical bracket on the right side of the PCI slots and are visible when the left side door is open. There are three LEDs for each PCI slot, as shown below.

Icon

Name

LED Function

Power On

Lights when the slot is receiving power.

Fault

Blinks while the card is being tested, when a hot-plug operation is in progress, or when the card is powered on but logically detached from the operating system.

Stays lit if the card encounters a fault.

OK-to-Remove

Lights when it is safe to remove the card.

The following table shows how to interpret the various possible LED patterns.

Interpretation

Off

Off

Off

The slot power is off. A PCI card can be safely inserted to start a hot-plug operation.

On

Blinking

Off

The installed card is being tested, configured, or deconfigured, or the card is powered on but logically detached from the operating system.

On

Off

Off

The slot power is on and the PCI card is operating normally.

Off

On

On

The PCI card has encountered a fault. The card can be safely removed.

Off

Off

On

The card can be safely removed.

Note - If the slot is empty and the Fault or OK-to-Remove LED is on, pressing the contact push button for the slot will clear the LED.

About Power Supply LEDs

There are three LEDs located on the rear of each power supply, as shown below.

Icon

Name

LED Function

Fault

Lights when the power supply encounters a fault.

AC-Present Status

Lights when AC power input is present and within acceptable operating limits.

DC Status

Lights when all DC outputs are functional and within acceptable operating limits.

About Fan Tray LEDs

The Thermal Fault LED on the system status and control panel indicates the overall status of the cooling system. The Thermal Fault LED lights when a fan fault or overtemperature condition is detected. LEDs inside the system indicate the fault status of each fan tray assembly.

The fan tray LEDs are located beside or beneath each fan tray assembly. There are three LEDs per fan tray, as shown below.

.

Icon

Name

LED Function

Power On

Lights when the fan tray is receiving power.

Fault

Lights when the fan tray encounters a fault.

OK-to-Remove

Lights when it is safe to remove the fan tray assembly from a powered-on system (only when redundant fan trays are present).

The following table shows how to interpret the various possible LED patterns.

Interpretation

Off

Off

Off

The fan tray is not receiving power or is improperly inserted.

On

Off

Off

The fan tray is receiving power and operating normally.

Off

On

On

The fan tray has encountered a fault and can be safely removed from a powered-on system.

About Disk Drive LEDs

The Disk Fault LED on the system status and control panel indicates the general status of the disk subsystem. The Disk Fault LED lights when a fault is detected in the disk subsystem. LEDs inside the system indicate the fault status of individual disk drives.

There are three LEDs for each disk drive. The disk drive LEDs are located on the front of the disk cage, as shown below.

Icon

Name

LED Function

Activity

Blinks slowly while the disk drive is being tested, configured, or deconfigured during a hot-plug operation.

Blinks rapidly as the disk drive spins up or spins down.

Stays lit when the disk drive is at speed and operating normally but experiencing no read or write activity. Blinks rapidly and irregularly in response to disk read or write activity.

Fault

Lights when the disk drive encounters a fault.

OK-to-Remove

Lights when it is safe to remove the disk drive during a hot-plug operation.

Blinks (under software control) to direct attention to a disk drive.

The following table shows how to interpret the various possible LED patterns.

Interpretation

Off

Off

Off

Slot power is off. A disk drive can be safely inserted as part of a hot-plug operation.

Rapid Blinking

Off

Off

Disk drive is spinning up or down.

Slow Blinking

Off

Off

Disk drive is being configured or deconfigured during a hot-plug operation.